oj.uz

Submission #1010533

# Submission time Handle Problem Language Result Execution time Memory
1010533 2024-06-29T07:53:03 Z 정민찬(#10827) Highway Tolls (IOI18_highway) C++17
90 / 100
 174 ms 11144 KB 
#include "highway.h"
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

long long ask(const std::vector<int> &w);
void answer(int s, int t);

vector<vector<pair<int,int>>> adj;
vector<int> dist;

void getDist(int st) {
	int N = adj.size();
	vector<int> vis(N, 0);
	queue<int> q;
	q.push(st);
	dist[st] = 0;
	vis[st] = 1;
	while (!q.empty()) {
		int x = q.front();
		q.pop();
		for (auto &[y, _] : adj[x]) {
			if (!vis[y]) {
				dist[y] = dist[x] + 1;
				vis[y] = 1;
				q.push(y);
			}
		}
	}
}

void find_pair(int N, vector<int> U, vector<int> V, int A, int B) {
	adj.resize(N);
	int M = U.size();
	for (int i=0; i<M; i++) {
		adj[U[i]].push_back({V[i], i});
		adj[V[i]].push_back({U[i], i});
	}
	int cnt = 0;
	assert(cnt <= 51); cnt ++;
	ll mndist = ask(vector<int>(M, 0));
	int num = mndist / (ll)A;
	int s = 0, e = N-1;
	vector<int> t(M, 0);
	while (s < e) {
		int mid = s + e >> 1;
		vector<int> w = t;
		for (int i=s; i<=mid; i++) {
			for (auto &[j, k] : adj[i]) {
				w[k] = 1;
			}
		}
		assert(cnt <= 51); cnt ++;
		ll ret = ask(w);
		if (ret == mndist) s = mid + 1, t = w;
		else e = mid;
	}
	int rt = s;
	dist.assign(N, 0);
	getDist(rt);
	vector<int> idx(N);
	iota(idx.begin(), idx.end(), 0);
	sort(idx.begin(), idx.end(), [&] (int &x, int &y) { return dist[x] > dist[y]; });
	s = 0; e = N-1;
	for (int i=0; i<N; i++) {
		if (dist[idx[i]] * 2 < num) {
			e = i-1;
			break;
		}
	}
	while (s < e) {
		int mid = s + e >> 1;
		vector<int> w(M, 0);
		for (int i=0; i<=mid; i++) {
			for (auto &[j, k] : adj[idx[i]]) {
				w[k] = 1;
			}
		}
		assert(cnt <= 51); cnt ++;
		ll ret = ask(w);
		if (ret == mndist) s = mid + 1;
		else e = mid;
	}
	int u = idx[s];
	getDist(u);
	vector<int> cand;
	vector<int> rev(N);
	for (int i=0; i<N; i++) {
		rev[idx[i]] = i;
	}
	for (int i=0; i<N; i++) {
		if (rev[i] > s && (ll)A * (ll)dist[i] == mndist) {
			cand.push_back(i);
		}
	}
	s = 0; e = cand.size() - 1;
	while (s < e) {
		int mid = s + e >> 1;
		vector<int> w(M, 0);
		for (int i=s; i<=mid; i++) {
			for (auto &[j, k] : adj[cand[i]]) {
				w[k] = 1;
			}
		}
		assert(cnt <= 51); cnt ++;
		ll ret = ask(w);
		if (ret == mndist) s = mid + 1;
		else e = mid;
	}
	int v = cand[s];
	answer(u, v);
}

Compilation message

highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:47:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |   int mid = s + e >> 1;
      |             ~~^~~
highway.cpp:73:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   73 |   int mid = s + e >> 1;
      |             ~~^~~
highway.cpp:99:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   99 |   int mid = s + e >> 1;
      |             ~~^~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 9 ms 1272 KB Output is correct
3 Correct 94 ms 9176 KB Output is correct
4 Correct 89 ms 9132 KB Output is correct
5 Correct 96 ms 9220 KB Output is correct
6 Correct 81 ms 9132 KB Output is correct
7 Correct 97 ms 9092 KB Output is correct
8 Correct 100 ms 8928 KB Output is correct
9 Correct 99 ms 8972 KB Output is correct
10 Correct 104 ms 9104 KB Output is correct
11 Correct 88 ms 8380 KB Output is correct
12 Correct 87 ms 8596 KB Output is correct
13 Correct 81 ms 8528 KB Output is correct
14 Correct 80 ms 8504 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 1112 KB Output is correct
2 Correct 14 ms 2020 KB Output is correct
3 Correct 23 ms 2908 KB Output is correct
4 Correct 65 ms 8180 KB Output is correct
5 Correct 63 ms 8180 KB Output is correct
6 Correct 65 ms 8360 KB Output is correct
7 Correct 64 ms 8184 KB Output is correct
8 Correct 74 ms 8664 KB Output is correct
9 Correct 64 ms 8188 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 9 ms 1368 KB Output is correct
3 Correct 72 ms 7060 KB Output is correct
4 Correct 94 ms 9116 KB Output is correct
5 Correct 90 ms 9072 KB Output is correct
6 Correct 98 ms 9108 KB Output is correct
7 Correct 93 ms 8892 KB Output is correct
8 Correct 94 ms 9012 KB Output is correct
9 Correct 93 ms 8956 KB Output is correct
10 Correct 101 ms 9264 KB Output is correct
11 Correct 91 ms 8524 KB Output is correct
12 Correct 86 ms 8180 KB Output is correct
13 Correct 92 ms 8428 KB Output is correct
14 Correct 102 ms 8284 KB Output is correct
15 Correct 91 ms 9072 KB Output is correct
16 Correct 87 ms 8784 KB Output is correct
17 Correct 99 ms 8296 KB Output is correct
18 Correct 90 ms 8328 KB Output is correct
19 Correct 100 ms 8928 KB Output is correct
20 Correct 94 ms 8184 KB Output is correct
21 Correct 80 ms 9704 KB Output is correct
22 Correct 89 ms 9648 KB Output is correct
23 Correct 82 ms 9956 KB Output is correct
24 Correct 75 ms 9624 KB Output is correct
25 Correct 82 ms 8548 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 1368 KB Output is correct
2 Correct 10 ms 1368 KB Output is correct
3 Correct 109 ms 9520 KB Output is correct
4 Correct 115 ms 10000 KB Output is correct
5 Correct 148 ms 10868 KB Output is correct
6 Correct 138 ms 11088 KB Output is correct
7 Correct 139 ms 11144 KB Output is correct
8 Correct 132 ms 10964 KB Output is correct
9 Correct 97 ms 7368 KB Output is correct
10 Correct 100 ms 7688 KB Output is correct
11 Correct 111 ms 8676 KB Output is correct
12 Correct 174 ms 10160 KB Output is correct
13 Correct 149 ms 10608 KB Output is correct
14 Correct 148 ms 10928 KB Output is correct
15 Correct 152 ms 10928 KB Output is correct
16 Correct 129 ms 8716 KB Output is correct
17 Correct 84 ms 9792 KB Output is correct
18 Correct 80 ms 9812 KB Output is correct
19 Correct 87 ms 9888 KB Output is correct
20 Correct 89 ms 9976 KB Output is correct
21 Correct 165 ms 11048 KB Output is correct

Subtask #6
21.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 1336 KB Output is correct
2 Correct 10 ms 1456 KB Output is correct
3 Correct 121 ms 9564 KB Output is correct
4 Correct 120 ms 9764 KB Output is correct
5 Correct 135 ms 10204 KB Output is correct
6 Correct 128 ms 10816 KB Output is correct
7 Correct 116 ms 9576 KB Output is correct
8 Correct 119 ms 9812 KB Output is correct
9 Correct 134 ms 10100 KB Output is correct
10 Correct 146 ms 10824 KB Output is correct
11 Correct 137 ms 11068 KB Output is correct
12 Correct 161 ms 11132 KB Output is correct
13 Correct 118 ms 8320 KB Output is correct
14 Correct 98 ms 7740 KB Output is correct
15 Correct 108 ms 8252 KB Output is correct
16 Correct 101 ms 7700 KB Output is correct
17 Correct 108 ms 8544 KB Output is correct
18 Correct 105 ms 8036 KB Output is correct
19 Correct 162 ms 10056 KB Output is correct
20 Correct 140 ms 10564 KB Output is correct
21 Correct 143 ms 10976 KB Output is correct
22 Correct 146 ms 11052 KB Output is correct
23 Correct 133 ms 11056 KB Output is correct
24 Correct 144 ms 11076 KB Output is correct
25 Correct 147 ms 11136 KB Output is correct
26 Correct 132 ms 11060 KB Output is correct
27 Correct 90 ms 9736 KB Output is correct
28 Correct 85 ms 9656 KB Output is correct
29 Correct 106 ms 10036 KB Output is correct
30 Correct 96 ms 9532 KB Output is correct
31 Correct 88 ms 9644 KB Output is correct
32 Partially correct 86 ms 9696 KB Output is partially correct
33 Correct 82 ms 9796 KB Output is correct
34 Correct 83 ms 9916 KB Output is correct
35 Correct 92 ms 10088 KB Output is correct
36 Correct 85 ms 9740 KB Output is correct
37 Correct 91 ms 9948 KB Output is correct
38 Correct 92 ms 9984 KB Output is correct
39 Correct 152 ms 11020 KB Output is correct
40 Correct 135 ms 10848 KB Output is correct
41 Correct 124 ms 11044 KB Output is correct
42 Correct 149 ms 10808 KB Output is correct